MEGADYNE聚氨酯圆带PR85RK系列MEGADYNE同步带皮带***解决方案型号圆带直径抗拉力强度N延伸率%***小轮径PR85RK66700.550PR85RK771000.560PR85RK881200.575PR85RK99170185PR85RK1010230190PR85RK12123301.5120PR85RK15155001.5150PR85RK18186801.5180)